Each plot of land will incorporate international coordinates.

The Ministry of Agriculture and Environment has just issued a Circular stipulating the technical regulations for integrating the content of cadastral surveying and mapping, land registration, cadastral record keeping, and the construction of a national land database.

According to regulations, the land parcel identification code is a sequence of characters established according to a unified structure, reflecting basic information such as administrative unit, map sheet, and parcel number. Each land parcel is assigned only one unique code, which is used throughout the entire process of registration, certificate issuance, land use change updates, and record management. The regulations also establish a unified process for building land parcel identification codes from the central to local levels. In the future, the land parcel identification code will integrate geographical coordinates according to international standards. This will also serve as a foundation for deploying online public services and electronic transactions related to land.

According to the circular, the process for creating land parcel identification codes consists of four steps:

Step 1, identify the characteristic point of the land parcel: on the spatial data layer of the land parcel, determine the positional coordinates (X, Y) of the characteristic point of the land parcel in the VN2000 coordinate system according to the central meridian of each locality.

A characteristic point of a land parcel is a point located within the land parcel boundary, determined from the coordinates of the parcel vertices using the Polygonlabel algorithm, ensuring that the point is located deep within the land parcel boundary, far from the land parcel edges.

Step 2 involves converting the position from the Vietnamese VN2000 coordinate system to the international WGS84 coordinate system. This involves converting the position of the land parcel's characteristic points in the VN2000 coordinate system to their geographical coordinates (latitude and longitude) in the global WGS84 geographical coordinate system. The formula for converting from the VN2000 coordinate system to the WGS84 international coordinate system follows current regulations.

Step 3, encode the location of the land parcel's characteristic points: use the GeoHash algorithm to encode the geographical coordinates (latitude and longitude) into a string of 12 alphanumeric characters. The land parcel's identifier is the encoded string of characters.

Step 4: Update the land parcel identifier in the land parcel code field of the data tables related to the land parcel in the cadastral spatial data group and the cadastral attribute data group of the cadastral database.

Source: https://vtv.vn/moi-thua-dat-se-tich-hop-toa-do-quoc-te-100260409151909775.htm